BackgroundIntermediaries are health-related workers who facilitate connections to local physical activities. Intermediaries deliver interventions by receiving referrals, conducting assessments, connecting referred individuals to activities and/or services in the community, and following up with them over time. However, it is unclear whether individuals who are referred to physical activities by an intermediary improve their physical activity levels, and what their perspectives and experiences are of participating in this intervention. To date there has been a lack of studies investigating the effect of this intervention on physical activity using appropriate outcome measures. MethodsThis will be a mixed methods pilot feasibility study. Participants will be individuals referred or self-referred to an intermediary and connected to local physical activities. Participants will be recruited through two types of intermediary services in Ireland; social prescribing and local sports partnerships. A total of 30 participants will be recruited (15 per service). Baseline demographic information will be taken upon enrolment to the study and three questionnaires will be completed: the International Physical Activity Questionnaire - Short Form, Self-Efficacy for Exercise Scale and Short Warwick Edinburgh Mental Well-being Scale. The questionnaires will be repeated after 12 weeks and in addition semi-structured interviews will be carried out to explore intervention content and delivery, as well as acceptability of the intervention and evaluation design. DiscussionThis overall aim of this proposed study is to investigate the feasibility of an intervention delivered by an intermediary to improve physical activity and health-related outcomes of community-dwelling individuals. RegistrationClinicalTrials.gov (NCT06260995).